Sent some btc to instawallet and didn't bookmark the address. Computer crashed. I guess I lost all the btc? Because I have no idea where to find the address. Anyone can help? Will give that person $50 usd.

"If neither your old session nor the Restore Session error page appears after a crash, or you accidentally click on “Start New Session”, you can enter about:sessionrestore in the Location Bar (address bar) to force the Restore Session page to appear, after first restoring a backup file to restore the old session data. The session data is stored in sessionstore.js; this file can be restored (while Firefox is not running) from backups, including "sessionstore.bak". The file "sessionstore.bak" is created if you launch Firefox after a crash has occurred. It is a copy of the current sessionstore.js that gets lost otherwise, if you restart Firefox."

If you can't find anything about your cookies/browsing history, I suggest that you write down your IP and check the blockexplorer for the transaction number. Maybe the guys at Instawallet can get it back for you.

Whether you choose to use a downloaded wallet or an online one, there are some potential gotchas to consider. If you lose your downloaded wallet—say through a system crash or theft—you also lose any coins stored in it. Likewise, if you use an online wallet such as Instawallet and lose the URL or authentication information for that wallet, or the service provider disappears, or anything else keeps you from reaching your online wallet, you may also lose coins. So be sure you have a backup and security strategy in place to avoid any problems later.

The Instawallet thingy strikes me as a ridiculous idea. The web is not designed around URL security. URLs are stored in browser history and company logs (yes, some companies preload self-signed roots that allow them to MIM all HTTPs traffic). They are phoned home by various toolbars and phishing filters. They are easy to leak out of negligence: support screenshots, forgotten data in the clipboard when connecting to VNC/Remote Desktop, etc. They are hard to remember when the computer inevitably dies, I know people who need to reinstall the OS once every few months and use their email accounts "draft" folder as storage space for things that are "really" important.

A quick test shows Instawallet does not even lock the wallet to the original country IP range. I can reload the page with IPs from different continents every few seconds. Not having an optional fallback email where I can recover the lost URL is a bonus feature.

The Instawallet thingy strikes me as a ridiculous idea. The web is not designed around URL security. URLs are stored in browser history and company logs (yes, some companies preload self-signed roots that allow them to MIM all HTTPs traffic). They are phoned home by various toolbars and phishing filters. They are easy to leak out of negligence: support screenshots, forgotten data in the clipboard when connecting to VNC/Remote Desktop, etc. They are hard to remember when the computer inevitably dies, I know people who need to reinstall the OS once every few months and use their email accounts "draft" folder as storage space for things that are "really" important.

A quick test shows Instawallet does not even lock the wallet to the original country IP range. I can reload the page with IPs from different continents every few seconds. Not having an optional fallback email where I can recover the lost URL is a bonus feature.

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The Instawallet thingy strikes me as a ridiculous idea. The web is not designed around URL security. URLs are stored in browser history and company logs (yes, some companies preload self-signed roots that allow them to MIM all HTTPs traffic). They are phoned home by various toolbars and phishing filters. They are easy to leak out of negligence: support screenshots, forgotten data in the clipboard when connecting to VNC/Remote Desktop, etc. They are hard to remember when the computer inevitably dies, I know people who need to reinstall the OS once every few months and use their email accounts "draft" folder as storage space for things that are "really" important.

A quick test shows Instawallet does not even lock the wallet to the original country IP range. I can reload the page with IPs from different continents every few seconds. Not having an optional fallback email where I can recover the lost URL is a bonus feature.

Ok, it works as advertised, providing an "instant" ewallet. But why ?

Pure, instant, unadulterated convenience. Use at your own risk.

Don't use Instawallet. Period. While it's run by an honest enough outfit it represents everything wrong about where and how you should store "YOUR MONEY". Use the official Bitcoin Client or MtGox.